I’m trying to determine if a string is a subset of another string. For example: chars <- “test” value <- “es” I want to return TRUE if “value” appears as part of the string “chars”. In the following scenario, I would want to return false: chars <- “test” value <- “et” 9 Answers 9
How would one change this input (with the sequence: time, in, out, files): Time In Out Files 1 2 3 4 2 3 4 5 To this output (with the sequence: time, out, in, files)? Time Out In Files 1 3 2 4 2 4 3 5 Here’s the dummy R data: table <- data.frame(Time=c(1,2), … Read more
I am having some trouble with leading and trailing white space in a data.frame. For example, I look at a specific row in a data.frame based on a certain condition: > myDummy[myDummy$country == c(“Austria”),c(1,2,3:7,19)] [1] codeHelper country dummyLI dummyLMI dummyUMI [6] dummyHInonOECD dummyHIOECD dummyOECD <0 rows> (or 0-length row.names) I was wondering why I didn’t … Read more
I am struggling to find the appropriate function that would return a specified number of rows picked up randomly without replacement from a data frame in R language? Can anyone help me out? 13 Answers 13
I would like to place two plots side by side using the ggplot2 package, i.e. do the equivalent of par(mfrow=c(1,2)). For example, I would like to have the following two plots show side-by-side with the same scale. x <- rnorm(100) eps <- rnorm(100,0,.2) qplot(x,3*x+eps) qplot(x,2*x+eps) Do I need to put them in the same data.frame? … Read more
I seem to be sharing a lot of code with coauthors these days. Many of them are novice/intermediate R users and don’t realize that they have to install packages they don’t already have. Is there an elegant way to call installed.packages(), compare that to the ones I am loading and install if missing? 32 Answers … Read more
When I need to filter a data.frame, i.e., extract rows that meet certain conditions, I prefer to use the subset function: subset(airquality, Month == 8 & Temp > 90) Rather than the [ function: airquality[airquality$Month == 8 & airquality$Temp > 90, ] There are two main reasons for my preference: I find the code reads … Read more
I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the columns. Assuming my data frame is df, and I want to extract columns A, B, and E, this is the only command I can figure out: data.frame(df$A,df$B,df$E) Is there a more compact … Read more
I have a set of data which looks something like this: anim <- c(25499,25500,25501,25502,25503,25504) sex <- c(1,2,2,1,2,1) wt <- c(0.8,1.2,1.0,2.0,1.8,1.4) data <- data.frame(anim,sex,wt) data anim sex wt anim2 1 25499 1 0.8 2 2 25500 2 1.2 2 3 25501 2 1.0 2 4 25502 1 2.0 2 5 25503 2 1.8 2 6 25504 … Read more
I have code that at one place ends up with a list of data frames which I really want to convert to a single big data frame. I got some pointers from an earlier question which was trying to do something similar but more complex. Here’s an example of what I am starting with (this … Read more